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Ruby
Kyanite Cyprine
Kyanite Cyprine and Ruby Physical Properties


Physical Properties
Tenacity
Brittle  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
3.97-4.05  
3.55-3.70  
Fracture
Conchoidal  
-  
Cleavage
No true cleavage  
Perfect  
Mohs Hardness
9  
4-7  
Chemical Composition
Al 2 O 3  
Al 2SiO 5Arthur Thomas , Gemstones (2009) More from other references  
Optical Properties >>
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Precious Gemstones

Precious Gemstones

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